Beneath the crystal-clear waters of the Indian Ocean island nation of the Seychelles, a fight is growing to save the coral reefs that shelter a range of creatures, from tiny invertebrates to the sprawling octopus, from climate change. The fragile reefs act both as a protective barrier for coastlines and an attraction for the tourists who keep the country’s economy going. But the reefs are also one of the first victims of rising ocean temperatures. The Seychelles in some areas lost up to 90 percent of its coral reefs in 1998 in an environmental event known as bleaching, where coral in warming...

A former Cambridge Analytica employee accused the data analytics firm of mishandling the personal information of more than 50 million Facebook users in an effort to help Donald Trump’s 2016 presidential campaign. Christopher Wylie, who helped found...